Crovax

Transformation. He loses concentration on all spells and can not cast in his new form his hit points become 134 + 72 temp HP He gains resistance to bludgeoning and piercing damage but gains vulnerability to thunder and fire.

Amorphous. You can squeeze through a space as narrow as 1 inch wide, provided you are wearing and carrying nothing. You are immune to the Grappled and Restrained conditions unless fully contained.

Encompassing Grapple. You have advantage on melee attacks against targets you have grappled.

Great Hunger. Take an action to consume a humanoid corpse and regain 11 (3d6) hitpoints.

Seige. Crovax deals double damage to objects and structures.

Frenzy. When below half (52) HP you must make a wisdom save DC 14 or attack the nearest creature to you. While frenzied you have advantage on attacks.

Multi-Attack. Can make two attacks using a weapon or tendril.

Tendril Strike. Melee Weapon Attack: +11 to hit, reach 10 ft., single target. Hit: 14 (2d12 + 6) bludgeoning, piercing or slashing damage. On a hit the target is grappled and can make an athletics check DC 18 to break free on its turn.

Slam Attack. Melee Weapon Attack: +11 to hit, reach 10 ft., single target. Hit: 26 (6d10 + 6) bludgeoning damage, if the target is currently grappled by you they take an extra 14 (4d10) bludgeoning.

Consuming Attack.  Melee Weapon Attack: +11 to hit, reach 10 ft., single target. Hit: 24 (4d8 + 6) and 11 (2d10) acid damage. If the target is reduced to 0 hitpoints regain 23 (5d8) hitpoints.

Splitting Defence. You can reduce the incoming damage from an attack by half. You can do this a number of times equal to proficiency.